天体的

One of the main works of astrometry is to observe celestial bodies, reduceobservational data and obtain the information of objects.

天体测量学的主要工作之一是利用天文望远镜观测天体，并对所得资料进行分析处理，获取目标天体的有用信息。

One of the main works of astrometry is to observe celestial bodies, reduce observational data and obtain the information of objects.

天体测量学的主要工作之一是利用天文望远镜观测天体，并对所得资料进行分析处理，获取目标天体的有用信息。

The specific research contents include: celestial coordinates The establishment of the Department; Sunday apparent motion of celestial bodies and the anniversary of the apparent motion; celestial parallax, atmospheric refraction, optical aberration, precession, nutation theory and applications; astronomical time measurement principles and time systems; depending on the location of celestial bodies return calculation methods.

具体的研究内容有：天球坐标系的建立；天体的周日视运动和周年视运动；天体的视差、大气折射、光行差、岁差、章动的理论及应用；天文时间计量的原则和时间系统的建立；天体视位置的归算方法等。

A pulsar is a celestial object that emits light in short burst a pulsar in the crab nebula flashes at a rate of 30 times/s,suppose the light pulses are caused by the rotation of a spherical object that emits light from a pair of diametrically opposed "flashlights" on its equator.

脉冲星是一种以短爆发形式辐射光的天体。假设球型天体赤道面上有一对"发光塔"，并且这对发光塔的联线构成赤道面的直径，进一步假设光脉冲产生于球形天体的转动，那么巨蟹座星云中的一个脉冲星的闪光频率是每秒30次。

The basic principle is based on spherical astronomy and elementary geometry of the trajectory mapping method based on the observation of a celestial body zenith distance, then the ship is located in order to sing the next point as the center of this satellite zenith distance of the ship's position as the radius of the circle, observing the same two objects, or objects at different times of the two observations, we can get two ship's position round, then the ship must have been a point of intersection of two ship's position on the circle.

其基本原理是建立在球面天文学和初等几何中的轨迹作图法基础上的，观测一个天体的天顶距，则航船就位于以星下点为圆心，此星天顶距为半径的船位圆上，观测两个天体或者不同时间同一天体的两个观测值，就可以得到两个船位圆，则航船一定在两个船位圆的一个交点上。

The motion of deep space probe is usually divided into three stages: parking orbit near Earth, transfer orbit toward the target body and the orbit around the target The Parking orbit, which is a kind of orbit of earth satellites, is not discussed in this thesis.

深空探测器的运动通常分为三个阶段：近地停泊轨道，飞向目标天体的过渡轨道和环目标天体的运行轨道，相当于目标天体的卫星。

The motion of deep space probe is usually divided into three stages: parking orbit near Earth, transfer orbit toward the targe...

深空探测器的运动通常分为三个阶段：近地停泊轨道，飞向目标天体的过渡轨道和环目标天体的运行轨道，相当于目标天体的卫星。

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

A pulsar is a celestial object that emits light in short burst a pulsar in the crab nebula flashes at a rate of 30 times/s,suppose the light pulses are caused by the rotation of a spherical object that emits light from a pair of diametrically opposed "flashlights" on its equator.

脉冲星是一种以短爆发形式辐射光的天体。假设球型天体赤道面上有一对&发光塔&，并且这对发光塔的联线构成赤道面的直径，进一步假设光脉冲产生于球形天体的转动，那么巨蟹座星云中的一个脉冲星的闪光频率是每秒30次。

In order to making an initial statistical research for the AGNs evolution, we investigated the distribution of the redshift and the spectral index and the flux densities in different wavebands.

从本文统计的谱指数和红移的关系图可以看出gamma波段的谱指数比x波段高，在天体的演化过程中是由高能量天体演化成低能量天体，从而得出一个演化序列：BL Lac天体过渡到低偏振类星体。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了